Greg Speirs is named in the 2006, 60th Year Diamond Edition of Who’s Who in America and to the 2006 20th Year Edition of Who’s Who in the World.Greg Speirs pavadintas 2006 m., 60. Metai Diamond Edition Who's Who in America ir 2006 m. 20. metai Edition Kas yra kas pasaulyje.

Who’s Who in America and Who’s Who in the World are published by Marquis, the leading publisher of Who’s Who directories in the world.Who's Who in America ir Who's Who in the World skelbia markizės, pirmaujančių leidėjai Kas yra kas katalogų pasaulyje.